Synthesis of vanadium doped tantalum oxy-nitride for photocatalytic reduction of carbon dioxide under visible light
Synthesis of vanadium doped tantalum oxy-nitride for photocatalytic reduction of carbon dioxide under visible light
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DOI：
10.1016/j.apsusc.2018.10.260
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发表时间：
2019-02
影响因子：
6.7
通讯作者：
Nguyen Thi Phuong Le Chi;N. Cam;Doan V. Thuan;T. Truong;N. T. Truc;Cao Van Hoang;T. T. Phuong-T.
中科院分区：
文献类型：
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作者：
Nguyen Thi Phuong Le Chi;N. Cam;Doan V. Thuan;T. Truong;N. T. Truc;Cao Van Hoang;T. T. Phuong-T.
我们成功地使用V作为掺杂剂来增强TaON的可见光光催化还原CO2为有价值的燃料的活性。我们研究了所使用的V掺杂剂存在于TaON晶格中，并取代了晶格中的几个Ta元素，导致所制备的V单键TaON的导带底降低，价带顶增加。因此，所制备的V单键TaON材料的带隙能量低于所制备的TaON材料的带隙能量，或者所制备的V单键TaON材料可以吸收大量的入射可见光，产生e-和h+对，它们参与与CO2和H2O反应生成CH 4、CO、O2和H2.我们还研究了最佳的V/Ta比（或V掺杂剂的最佳量），以最大限度地提高TaON的光催化活性为1.5wt%。制备的1.5V单键TaON可见光光催化转化CO2和H2O生成CH 4、CO、O2和H2，生成速率分别为673、206、1479和67（µmol·g−1cat·h−1）。
We successfully used V as dopant to enhance activity of TaON for visible light photocatalytic reduction of CO2into valuable fuels. We investigated that the used V dopants existed in the TaON lattice and replaced several Ta elements in the lattice leading to decrease in the conduction band minimum and increase in the valence band maximum of the prepared Vsingle bondTaON. Hence, the band gap energy of the prepared Vsingle bondTaON was lower than that of prepared TaON or the prepared Vsingle bondTaON material could absorb significant amount of incident visible light for production of e−and h+pairs, which participated in reactions with CO2and H2O to generate CH4, CO, O2and H2. We also investigated that the optimal V/Ta ratio (or optimal amount of V dopant) for maximum enhancing photocatalytic activity of TaON was 1.5 wt%. The prepared 1.5Vsingle bondTaON visible light photocatalytically converted CO2with H2O to generate CH4, CO, O2and H2with generation rates of 673, 206, 1479 and 67 (µmol·g−1cat·h−1), respectively.